High efficiency gas lighting device for an electric household appliance

Abstract

A gas lighting device including: a body formed by an electrically insulating material carrying a plurality of high-voltage outputs for the connection of spark generating means; a transformer accommodated in the body and including a primary winding wound around and carried by a ferromagnetic material core, a carrying element formed by an electrically insulating material and designed to contain the primary winding therein, and a secondary winding consisting of a plurality of coils externally carried by the carrying element, electrically insulated from the primary winding and essentially coaxial with the latter; the core is ring-shaped on a plane parallel to an axis (A) of the windings and consists of two half rings reciprocally coupled and arranged facing and closely adjacent to each other in the direction of the axis of the windings; a first circumferential portion of the ring-shaped core, formed by one or both of the half rings, is accommodated inside the carrying element so as to be surrounded by the windings, while a second circumferential portion of the core is formed parallel to the first and radially on the outside of the windings so as not to be surrounded by the same.

1. A gas lighting device, comprising:
 a body formed by an electrically insulating material and carrying a plurality of high-voltage outputs for connection of spark generating units; 
 a transformer accommodated in the body and including
 a ferromagnetic material core, 
 a primary winding wound about and carried by the ferromagnetic material core, 
 a carrying element formed by an electrically insulating material and containing the primary winding therein, and 
 a secondary winding including a plurality of coils externally carried by the carrying element, electrically insulated from and coaxial with the primary winding, 
 
 wherein 
 said ferromagnetic material core is ring-shaped on a plane parallel to an axis of said windings and includes first and second half rings reciprocally coupled and arranged facing and closely adjacent to each other in the direction of the axis of said windings; 
 a first circumferential portion of the core, formed by the first half ring or both the half rings, is accommodated inside the carrying element and surrounded by said windings, 
 a second circumferential portion of the core, formed by the second half ring or both the half rings and away from the first circumferential portion, is arranged parallel to the first circumferential portion and radially on the outside of both said primary and secondary winding, so as not to be surrounded by said windings, 
 said carrying element includes a drum coaxially arranged with said windings and supporting the windings, 
 said high-voltage outputs each includes an electric terminal, and an electrically insulating support for the electric terminal, the electrically insulating support being integrally formed in one piece with the drum; and 
 the electrically insulating supports for the electric terminals are formed at opposite ends of said drum, on both sides of each of said ends. 
 
     
     
       2. The gas lighting device according to  claim 1 , wherein
 said half rings forming said core are shaped, on said plane parallel to the axis of the windings, as two U-shapes having facing concavities; 
 each of said first and second circumferential portions of the core is formed by corresponding facing branches of the first and second U-shaped half rings, 
 the branches are reciprocally adjacent to each other and extend parallel to the axis of the windings, the branches being reciprocally connected by a base of each half ring, and the branches extending perpendicularly to the windings without being surrounded by the windings. 
 
     
     
       3. The gas lighting device according to  claim 1 , wherein
 said half rings forming said core are shaped, on said plane parallel to the axis of the windings, as two L-shapes having facing opposite ends; 
 each of said first and second circumferential portions of the core is formed by a corresponding first wing of the L-shape of the respective first or second half ring, the first wing extending parallel to the axis of the windings; and 
 a second wing of the L-shape of each of the first and the second half rings is arranged perpendicular to the respective first wing without being surrounded by said windings. 
 
     
     
       4. The gas lighting device according to  claim 1 , wherein said ferromagnetic material core has a prismatic shape. 
     
     
       5. The gas lighting device according to  claim 1 , wherein said half rings are reciprocally separate, in the direction of said axis of the windings, by a predetermined gap. 
     
     
       6. The gas lighting device according to  claim 1 , wherein said half rings are in reciprocal direct contact, in the direction of said axis of the windings. 
     
     
       7. The gas lighting device according to  claim 1 , wherein said high-voltage outputs each further comprise
 a prismatic tubular element that accommodates said corresponding electric terminal integrally carried by the corresponding support. 
 
     
     
       8. The gas lighting device according to  claim 7 , wherein
 said supports for the electric terminals laterally overhangingly protrude from the drum. 
 
     
     
       9. The gas lighting device according to  claim 8 , wherein
 said body formed by electrically insulating material is cup-shaped so as to define an internal concavity provided with a mouth through which said body receives in said concavity said carrying element with said primary and secondary windings and said core pre-mounted thereon; 
 said concavity being filled with an electrically insulating resin, in which said carrying element, said windings and at least said first circumferential portion of the core are embedded. 
 
     
     
       10. The gas lighting device according to  claim 9 , wherein
 said prismatic tubular element of each said high-voltage output is integrally formed in one piece with the corresponding support, so as to be an integral part of said carrying element; 
 the carrying element is accommodated within said concavity with said prismatic tubular elements facing towards the outside of said concavity and protruding outwards from the concavity through said mouth, so as to be overhangingly protruding out from said resin. 
 
     
     
       11. The gas lighting device according to  claim 1 , wherein opposite ends of each said coil belonging to the second winding are electrically directly connected to the corresponding adjacent electric terminals of the high-voltage outputs. 
     
     
       12. The gas lighting device according to  claim 1 , wherein said ferromagnetic material core has a square-shaped cross section. 
     
     
       13. The gas lighting device according to  claim 7 , wherein each of the electric terminals includes a faston type strip contact.